BT137 Triacs: Circuit, Pinout, and Datasheet [Video&FAQ]
TRIAC 800V 8A TO220AB
The BT137 is a passivated triac in a plastic envelope that is designed for applications that require strong bidirectional transient and blocking voltage capability as well as good thermal cycling performance.

Automatic night light circuit BT137
BT137 Description
The BT137 is a passivated triac in a plastic envelope that is designed for applications that require strong bidirectional transient and blocking voltage capability as well as good thermal cycling performance. Motor control, industrial and home lighting, heating, and static switching are examples of common applications.
BT137 Pinout
The following figure is the Pinout of BT137.

Pinout
| Pin Number | Pin Name | Description |
| 1 | T1 | main terminal 1 |
| 2 | T2 | main terminal 2 |
| 3 | G | gate |
| mb | T2 | mounting base; main terminal 2 |
BT137 CAD Model
The followings are the Symbol, Footprint and 3D Model of BT137.

Symbol

Footprint

3D Model
BT137 Features
• Planar passivated for voltage ruggedness and dependability
• Triggering in all four quadrants
• High blocking voltage capabilities
• Less sensitive gate for increased noise immunity
Specifications
- TypeParameter
- Surface Mount
having leads that are designed to be soldered on the side of a circuit board that the body of the component is mounted on.
NO - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
TO-220-3 - Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Through Hole - Voltage-Off State800V
- Number of Elements1
- Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tube - Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
125°C TJ - Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Active - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - Number of Terminations3
- HTS Code
HTS (Harmonized Tariff Schedule) codes are product classification codes between 8-1 digits. The first six digits are an HS code, and the countries of import assign the subsequent digits to provide additional classification. U.S. HTS codes are 1 digits and are administered by the U.S. International Trade Commission.
8541.30.00.80 - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
BT137 - Reference Standard
In the context of electronic components, the term "Reference Standard" typically refers to a specific set of guidelines, specifications, or requirements that serve as a benchmark for evaluating the quality, performance, and characteristics of the component. These standards are established by organizations such as the International Electrotechnical Commission (IEC), the Institute of Electrical and Electronics Engineers (IEEE), or specific industry bodies.Reference standards help ensure consistency and interoperability among different components, as they provide a common framework for manufacturers, designers, and users to adhere to. They outline parameters such as electrical properties, mechanical dimensions, environmental conditions, and safety considerations that the component must meet to be considered compliant.By referencing these standards, manufacturers can design and produce components that meet industry-recognized criteria, which in turn helps users select the right components for their applications with confidence. Adhering to reference standards also facilitates regulatory compliance and promotes overall quality and reliability in electronic systems.
IEC-60134 - JESD-30 Code
JESD-30 Code refers to a standardized descriptive designation system established by JEDEC for semiconductor-device packages. This system provides a systematic method for generating designators that convey essential information about the package's physical characteristics, such as size and shape, which aids in component identification and selection. By using JESD-30 codes, manufacturers and engineers can ensure consistency and clarity in the specification of semiconductor packages across various applications and industries.
R-PSFM-T3 - Configuration
The parameter "Configuration" in electronic components refers to the specific arrangement or setup of the components within a circuit or system. It encompasses how individual elements are interconnected and their physical layout. Configuration can affect the functionality, performance, and efficiency of the electronic system, and may influence factors such as signal flow, impedance, and power distribution. Understanding the configuration is essential for design, troubleshooting, and optimizing electronic devices.
Single - Case Connection
Case Connection refers to the method by which an electronic component's case or housing is connected to the electrical circuit. This connection is important for grounding purposes, mechanical stability, and heat dissipation. The case connection can vary depending on the type of component and its intended application. It is crucial to ensure a secure and reliable case connection to maintain the overall performance and safety of the electronic device.
MAIN TERMINAL 2 - JEDEC-95 Code
JEDEC-95 Code is a standardized identification system used by the Joint Electron Device Engineering Council to categorize and describe semiconductor devices. This code provides a unique alphanumeric identifier for various memory components, ensuring consistency in documentation and communication across the electronics industry. The format includes information about the type, capacity, and technology of the device, facilitating easier specification and understanding for manufacturers and engineers.
TO-220AB - Trigger Device Type
Trigger Device Type is a parameter in electronic components that refers to the type of device or mechanism used to initiate a specific action or function within the component. This parameter specifies the specific trigger device, such as a sensor, switch, or signal input, that is required to activate or control the operation of the component. Understanding the trigger device type is crucial for proper integration and operation of the electronic component within a larger system or circuit. By specifying the appropriate trigger device type, engineers and designers can ensure that the component functions correctly and responds to the intended input signals or conditions.
4 QUADRANT LOGIC LEVEL TRIAC - Voltage - Gate Trigger (Vgt) (Max)
Voltage - Gate Trigger (Vgt) (Max) refers to the maximum voltage level required to trigger the gate of a semiconductor device, such as a thyristor or triac, into the conductive state. When the gate receives this voltage, it initiates the device's conduction, allowing current to flow between its anode and cathode. Exceeding this voltage can lead to unwanted behavior or damage to the component, making it a critical parameter in designing circuits that utilize these devices. Understanding Vgt is essential for ensuring proper operation and reliability in electronic applications.
1.5V - Current - Non Rep. Surge 50, 60Hz (Itsm)
The parameter "Current - Non Rep. Surge 50, 60Hz (Itsm)" in electronic components refers to the maximum non-repetitive surge current that a component can withstand without damage during a single surge event at frequencies of 50Hz or 60Hz. This parameter is important for assessing the robustness and reliability of the component in handling sudden spikes or surges in current that may occur in the electrical system. It helps in determining the level of protection needed for the component to ensure its longevity and proper functioning in various operating conditions. Manufacturers provide this specification to guide engineers and designers in selecting the appropriate components for their applications based on the expected surge current levels.
65A 71A - Current - Gate Trigger (Igt) (Max)
Current - Gate Trigger (Igt) (Max) refers to the maximum gate trigger current required to activate a semiconductor device, such as a thyristor or triac. It is the minimum current that must flow into the gate terminal to ensure that the device turns on and conducts current between its anode and cathode. Exceeding this value can lead to unnecessary power consumption, while insufficient current may prevent the device from turning on effectively. This parameter is crucial for circuit design, as it influences the selection of gate driving circuits.
35mA - Current - Hold (Ih) (Max)
The parameter "Current - Hold (Ih) (Max)" in electronic components refers to the maximum current required to maintain the component in a latched or on-state after it has been triggered. This parameter is commonly associated with relays, switches, and other devices that have a latching function. It is important because it determines the minimum current that must be supplied to keep the component in its activated state, ensuring reliable operation. Exceeding the maximum Ih value can lead to the component failing to hold its state, potentially causing malfunctions or disruptions in the circuit.
20mA - Current - On State (It (RMS)) (Max)
The parameter "Current - On State (It (RMS)) (Max)" refers to the maximum root mean square (RMS) current that an electronic component, typically a semiconductor device like a thyristor or a transistor, can handle while in the on state without sustaining damage. This value is crucial for ensuring that the component operates safely under load conditions. Exceeding this maximum rating can result in overheating, degradation, or failure of the component over time. It is an important specification for designers to consider when selecting components for a circuit to ensure reliable performance.
8A - Repetitive Peak Off-state Voltage
The Repetitive Peak Off-state Voltage (Vdrm) is a key parameter in electronic components, particularly in devices like thyristors and triacs. It refers to the maximum voltage that can be applied across the component when it is in the off-state without triggering it to turn on. This parameter is crucial for ensuring the proper functioning and reliability of the component in various circuit applications. It helps determine the voltage level at which the component can safely operate without experiencing unintended conduction. Designers need to consider the Vdrm rating to prevent damage to the component and maintain the overall performance of the circuit.
800V - Triac Type
Triac Type refers to the classification of triacs based on their electrical characteristics and applications. Triacs are semiconductor devices that can control current flow in both directions and are commonly used in AC power control. Different types of triacs may have variations in parameters such as voltage rating, current rating, triggering method, and switching speed, making them suitable for specific applications like light dimmers, motor speed controls, and heating regulation. Understanding the triac type is crucial for selecting the appropriate component for a given circuit design.
Standard - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
RoHS Compliant
How to use BT137 Triacs
As to the related circuit of BT137 Triacs, the following figure is shown to you.

Circuit
High areas are to be used to control the mains. A 220V lamp is contained in this moiety, which includes R1, R2, C4, and the triac BT137 TRC1. When a phone call is received, the photo BT137 Triac gate terminal portion of the optocoupler is triggered, and the lamp turns on. The light export process continues until the voltage from the mains drops below a certain level.
BT137 Alternatives
| Part Number | Description | Manufacturer |
| BT137X-600DTRIGGER DEVICES | 4 Quadrant Logic Level TRIAC, 600V V(DRM), 8A I(T)RMS, TO-220AB, PLASTIC, TO-220F, FULL PACK-3 | WeEn Semiconductor Co Ltd |
| BT137X-600ETRIGGER DEVICES | TRIAC, 600V V(DRM), 8A I(T)RMS, | Philips Semiconductors |
| 934037850127TRIGGER DEVICES | 4 Quadrant Logic Level TRIAC, 600V V(DRM), 8A I(T)RMS, TO-220AB, PLASTIC, TO-220F, 3 PIN | WeEn Semiconductor Co Ltd |
| BT137X-600FTRIGGER DEVICES | TRIAC, 600V V(DRM), 8A I(T)RMS, | Philips Semiconductors |
| BT137X-600F,127TRIGGER DEVICES | 4 Quadrant Logic Level TRIAC, 600V V(DRM), 8A I(T)RMS, TO-220AB, PLASTIC, TO-220F, FULL PACK-3 | WeEn Semiconductor Co Ltd |
| BT137X-600,127TRIGGER DEVICES | BT137X-600 | NXP Semiconductors |
| BTA208X-600BTRIGGER DEVICES | 600V, 8A, SNUBBERLESS TRIAC, TO-220AB, PLASTIC, TO-220, FULLPACK-3 | NXP Semiconductors |
| BTA208X-600B,127TRIGGER DEVICES | Snubberless TRIAC, 600V V(DRM), 8A I(T)RMS, TO-220AB, PLASTIC, TO-220F, FULLPACK-3 | WeEn Semiconductor Co Ltd |
| BT137X-600TRIGGER DEVICES | 600V, 8A, 4 QUADRANT LOGIC LEVEL TRIAC, PLASTIC, FULL PACK-3 | NXP Semiconductors |
| BT137X-600G,127TRIGGER DEVICES | BT137X-600G | NXP Semiconductors |
BT137 Applications
• General Purpose Motor Controls
• General Purpose Switching
BT137 Package
The following figure is the Package of BT137.

Package
BT137 Manufacturer
WeEn Semiconductors Co., Ltd is a Chinese semiconductor company based in Shang, China. It was created in January 2016 and is registered in Nanchang, China. In Jilin, Shanghai, Hong Kong, the United Kingdom, and other places, it has expanded its subsidiaries and branches. WeEn is committed to providing a broad range of innovative bipolar power products based on their cutting-edge bipolar power technology.
Silicon-controlled rectifiers, power diodes, high voltage transistors, and silicon carbide are among the goods that are widely utilized in markets such as automotive, telecommunications, computers and consumer electronics, intelligent home appliances, lighting, and power management. They want to improve China's development by making manufacturing more intelligent and cost-effective.
Trend Analysis
Datasheet PDF
- PCN Part Status Change :
- PCN Assembly/Origin :
- Datasheets :
- PCN Other :
- PCN Packaging :
1.How much current can the BT137 pass without a heat sink?
BT137 is a bidirectional thyristor with a rated on-state current of 8A. Without a heat sink, 8A can be passed in a short time (1 second) after triggering. Since the on-state voltage drop is 1.3V, the long-term on-state current should not exceed 1A without the heat sink, depending on the ambient temperature and natural heat dissipation. Actually, it can be determined according to the temperature rise of the test.
2.Can SCR BT137 600E replace BT136 600E?
Thyristor BT137 600E can replace BT136 600E.
3.Why does BT137 directly drive the G pole voltage, but it seems to be on all the time?
BT137 is a two-way thyristor, it will always be on as long as the current is not less than its maintenance value after it is turned on, and it has nothing to do with the voltage of the G pole. Only when the current is less than the holding value, it will be turned off, and its turn-on again after it is turned off will be controlled by the voltage of the G pole.
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